Agree, I bought a brand new iMac 5k 2019 in the summer of 2020 and it was super sprightly until I installed Big Sur and it’s super slow to boot and sometimes tediously slow just to use. I created an external SSD boot drive and installed 32gb of ram and it takes 52 seconds to boot up!!! What the hell!!! I’ve got a 2009 MacBook that boots quicker Han this 6 core i5. What’s going on apple???? Very poor show.